Double-image radio picture



Oct. 27, 1925.

(l F. JENKINS DOUBL IMAGE -RAD PXCTURE :mea may e. 1225 Patented 0d. 27, 1925.

UNITED STATES CHARLES FRANCIS JENKINS, OF WASHINGTON, DISTRICT 0F GCLUMBIA.

DOUBLE-IMAGE RADIO PICTURE.

Application led May 5, 1925.

To all whom t may concern:

Be it known that I, CHARLns FRANCIS JENKINS, citizen of the United States, residing at Washington, District of Columbia, have invented certain new and useful Improvements in Double-Image Radio Pictures, of which the following is a speciiication.

This invention relates to apparatus for radio vision and radio movies, and has for its principal object mechanism which will be continuous in motion and quiet in operation, and capable of the necessary high speed to come within the period of persistence of vision, i. e., standard motion picture speed of sixteen picture frames per second.

As is now well known, the generally accepted method of transmitting pictures electrically by radio or by wire, is-to analyze the picture in lines by sweeping it across a light sensitive cell thousands of times .per second to convert the light values of., the picture into electric current values; and at the'receiving station to synthesize the picture m a li lie-number of lines.

For this reason the usual method of moving motion picture film intermittently across the source of illumination is not the best method, for the reason that, in this pointline method of analysis the eye does not see the whole picture, as it does in theatre picture projection, but sees only a single point of light at any one time, and, therefore, there should be the least possible dark-time interval, as the point of light, moving in adjacent lines makes up the picture with almost incredible swiftness.

Continuous motion of the lm across the light is by far the most successful method, and means to this end are employed in the apparatus the subject of this application.

`With this and other objects in view the invention consists in the novel details of assembly of the various elements employed, hereinafter disclosed, and particularly pointed out in the claims.

In the drawings Fig. 1 is a schematic drawing of the apparatus employed when sending from a living subject, and Fig. 2 a drawing of the apparatus employed when sending from a motion picture film.

In both the figures like symbols refer to like parts, in which A is a light-sensitive cell; B a lens-disc; C a ground-glass screen; D a prismatic disc (Patent No. 1,385,325);

Serial No. 28,223.

F. an objective lens; F an animated figure; and G a shaft upon which both the prism and lens-carrier are mounted. H is a motion picture film, K a condenser lens; and L a source of illumination. y

In operation the iig-ure F would be focused by the lens E on the ground-glass except for the interception of prism D which deliects the image to the top of the groundgiass C. From this point the lenses of lensdisc B vfocus the first image at a point below the light-sensitive cell A.

The rotation of the prismatic ring D causes the image of the figure F to sweep across the ground-glass from top to bottom.

At the same time the lenses of lens disc B each in turn sweep the second image, i. e., the image of the first image, across the light cell in a horizontal direction. As there are many lenses there will be many trips of the image across the cell during a single rotation of the prism disc. The combined movement produces the usual lined analysis of the picture, and the picture sweeping across the cell changes the light values of the picture into electric values in the well-known manner.

In Fig. 2 the picture frames on the lilm H are focused by lens E onto the groundglass C, being illuminated by the lightsource L.

The film in motion gives the necessary travel across the ground-glass C, while the lens-disc in rotation again gives the lateral analytical movement.

In both figures, in order to get the greatest amount of light on the cell, the groundglass C is removed as soon as the lens E and the lenses on the lens disc B are properly focused. This, of course, gives only aerial images, but such images give more than twice the light attainable when the ground glass remains in position.

TWhat I claim, is-

l. The combination of means for forming an image of an object, means for giving linear movement to said image7 means for forming an image of said first image, means for giving linear movement to said second image a plurality of times and at approximately right angles to the movement of said lirst image, and a light sensitive cell located to be swept by said second image.l

2. The combination of means for forming an aerial image of an object, means for giving linear movement to said image, means for forming an aerial image of said first image3 and means for giving linear movement i'o said serond image a pluialicj,7 of times and in a direction approximately at righi angles to tlie movement oi' said first image.

3. The combination oi means lor forming an image of an objec, means i'or givini;` linear movement io said image, means ior forming an image of saiil iirst image, and means for giving lineal.l movenient to said second image a Qiuralit)Y o? aif'fsT and in a direction approximaeiy at right angles to the movement olt saiil {irst image.

vomoinai'ien of means for iiorming an image olf an objee, means for giving movement io said image7 means for forming` an image of said iii'st image, and means for giving movement to said second image in a direc ion approximately at right angles io iiie me einem of said saifLk irse image.

riflie eoi'nl-iinaion oif a motion picture film, means for moving .sai/il film loiiggil'iniinalljx, means for forming an image oi the picture frames on said iilm, means oi' Lormingv an image oi said irs'a im" and means for giving linear movement to said second image a plurality oif times and at right angles to the movement of said iilm.

(5. The Combination of a motion picture ilm7 means for moving said iilm longitudinelly, means for forming an image of the picture frames on said film, means for forming an image of said first image, and means 'for giving linear movement to said second image a ilnrality of times and approximately at right angles to the movement of said Him, and a light-sensitive cell located to be swept by second image.

T. The eomliinaion o' a moion picture film,f means ior giving' lono'iiiilinal meyeiaent io saiil ia'nc a iens 'for iin-Wing Jlie Vivian-e iii' ine on saiil iilm, a rotaii carrier L, ilieri oi accession move across the optical l iii The on 'i an iniage-iiorming a prismaie ring loeaeil in ille or' said elei'nen.;T and a rotatable a plnralily of image ferming n, eaeli oi' Wliicl in suo-eession moves across lie optical axi of said first image forming elei'nen.

U. The eombinalfion of an image-forming iens, a roa'alile prismatie ringl locaecl in 'iie optical axis of said lens, a rotatable carrier having a plurality of lenses therein each of which in succession moves across tile opieal axis of said 'irst lens7 and means for rotating V"alie prism ring and the lons larrier in s i'nelironism.

in 'testimony n'lieroo l have aiiixeil my signature.

HT i

l )tical axis 

